Enzymes are catalysts at work in the human body. Enzymes are made from amino acids. What are the most enzymes in the body?

a) proteins
b) fats (lipids)
c) carbohydrates
d) DNA

Which theory was contradicted by experiments with the photoelectric effect? light spreads out after it passes through a small opening. as soon as light strikes metal, electrons will be ejected. visible light, regardless of color, will cause the ejection of electrons when striking metal. the kinetic energy of ejected electrons depends on the frequency of light that strikes the metal.